Here's what's next for Minnesota DWI cases impacted by testing equipment errors

The head of the Minnesota Bureau of Criminal Apprehension explained on Monday what caused hundreds of faulty DWI tests .

"There's been a number of human errors that we've identified with these instrumentations," Minnesota BCA Superintendent Drew Evans said.

The DMT test, which is putting into question hundreds, if not thousands, of DWI cases in the state, is not the standard roadside field sobriety test. It's a secondary breath test administered in jails or police stations.

The machine used for the tests has a bottle that holds gases to ensure the test is calibrated correctly.

A photo of a DataMaster instrument. The Minnesota Bureau of Criminal Apprehension said on Friday that errors were discovered by operators installing gas cylinders (circled in red) onto the machine. WCCO

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